Each of the evil NPCs has someone they have a fight with. For Viconia, it's Keldorn. For Edwin it's Minsc, and for Korgan it's Aerie (though Aerie doesn't fight; she simply leaves the party). I've had Edwin and Minsc in my party before and I've seen it happen. It's random. A great pain in the ass, though, which is why I replaced Minsc with Korgan eventually, as much as I like Minsc - Viconia's too good a cleric to drop for someone like Aerie.
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